How to change height of Q-Layout having Q-toolbar and Q-tabs

I am new in quasar and got stuck in below issue.
I am making Header component for my UI. I have used QLayout component as my main component and inside that i have used q-toolbar and q-tabs as suggested in documentation to make my header looks cool.

The height of my quasar layout looks too big. How can i reduce the height of my layout?

I have attached the screenshot as well.

In my UI q-tabs are not responsive. When i am reducing the size of chrome window, They are getting suppressed. I want to align then 1 below other. Can i do that with quasar components?